Abu Sa`id Al-Khudri and Abu Huraira reported that the Prophet, peace by upon him, said, “When any group of men remember Allah, angels surround them and mercy covers them, tranquility descends upon them, and Allah mentions them to those who are with Him.” Narrated by Muslim, Tirmidhi, Ahmad, Ibn Majah, and Bayhaqi.

Muslim, Ahmad, and Tirmidhi narrate from Mu`awiya that the Prophet went out to a circle of his Companions and asked: “What made you sit here?” They said: “We are sitting here in order to remember / mention Allah (nadhkurullaha) and to glorify Him (wa nahmaduhu) because He guided us to the path of Islam and he conferred favours upon us.” Thereupon he adjured them by Allah and asked if that was the only purpose of their sitting there. They said: “By Allah, we are sitting here for this purpose only.” At this the Prophet said: “I am not asking you to take an oath because of any misapprehension against you, but only because Gabriel came to me and informed me that Allah, the Exalted and Glorious, was telling the angels that He is proud of you!”